Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1993-06-16
1995-12-05
Hjerpe, Richard H.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 94, 345204, G09G 336
Patent
active
054733383
ABSTRACT:
The optical response of the pixels of many flat panel display devices, such as liquid crystal displays (2), depends upon the spectral components, as well as the rms value, of the pixel voltage waveform during a frame period. Because each row and column electrode (10 and 11) addresses multiple pixels (14), the spectral voltage components of the voltage across any pixel during a frame period will depend upon the optical state of other pixels in the same column (11). This crosstalk phenomena can be greatly reduced by modifying the addressing signals. One method of modifying the addressing signals is to modulate them so that the spectral components of all pixel voltage waveforms fall primarily in a frequency band (54) in which the optical response is nearly independent of the frequency. Another method is to analyze (220) the spectral components of the pixel voltage waveform over a frame period before it is displayed and adjust (222) the amplitude of the addressing signals to compensate for the frequency dependence of the optical response. When using a gray scale addressing method involving an adjustment factor, such as one based upon virtual pixels (266), the value of each virtual information element (270) is multiplied by a correction factor to compensate for the different frequency components associated with the virtual row.
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Clifton Benjamin R.
Grosspietsch John K.
Prince Dennis W.
Scheffer Terry J.
Hjerpe Richard H.
In Focus Systems, Inc.
Motorola Inc.
Saras Steven J.
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